This problem has been going on for several hundred hours. We change the oil and filter every season. We run over eight hundred acres a year through this machine. The hyrostat system and the hydraulic system are two completly seperate systems so it is not starving for oil. When we have the most problem is when we are combining in second gear,high rpm. It does it only when there is no pull on the machine such as going down hill or turning around. It will try to hold itself back then it puts forward pressure on the system again. This is not a big jerk it is just the slack between being under load and trying to hold itself back. It will do this 2-3 times before it "pops" free and it is free wheeling. The machine will coast to a complete stop and sit there for a short period of time then all of a sudden slam back to the speed that you was running or wherever the hydrostat lever is. We have always thought that it might be sucking air allowing itself to suck the oil out of the hydrostat pump and then when it reprimes itself which would give us the big jerk. We have never found any leaks though. We have been looking for a vaccum leak and havent found it and there is absolutly no oil leaks on it anywhere. We are wondering if there could be a high pressure valve that is messing up since it happens more at high rpm. We have all the books for this machine, operaters, service, and parts, except for the one that goes into detail about the hydrostat which we would like to have if anyone knows what number the book is.
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